424 



PARASITES OF ANIMALS 



and the same thing was observed by Busk in P. convolutus. 

 In the instance here drawn (Fig. 71) one of the embryos is in 

 the act of emerging, its caudal extremity being still lodged 

 within the vulva of the parent. In the fresh worm one may also 

 see, under the magnifying glass, numerous young worms coiled 

 together within the oviduct ; the last-named organ widening out 

 into a capacious sac at a little distance above the end of the 

 tail. The embryos measure about g^" by 3^5" in breadth. 



FIG. 70. Tail of the male Prosthecosacter contolutus. Highly magnified. After Busk. 



Higher up, within the uterine and ovarian ducts, the ova may be 

 seen in all stages of development, according to the particular 

 region of the tube under examination. In their full-grown 

 condition the eggs have a longitudinal diameter of n^" by a 

 transverse measurement of about p^"' 



As regards the development and migrations of the young 

 worms, it is highly probable that the embryos enter the bodies 

 of various fishes before they have acquired sexual maturity. 



